Mine is a flat piece if acrylic placed diagonal in the corner but i would think a 1/4 rip cut of say maybe 6 inch diameter or greater pvc might work in that case. Google the "durso standpipe" design and try to make that first as to allow enough room for its use. dont glue it bacause you may have to tweak it once water starts flowing as it is related to the teeth height you are wanting to make. That thing rocks!!! | 
